Manufacture of red lead.



G. V. BARTON.

MANUFACTURE OF RED LEAD APPLIOATION FILED IBB Patented Apr. 11, 1911.

2 BHEETSBHEET 1.

G. V. BARTON.

MANUFACTURE OF RED LEAD.

- APPLICATION rum) I'BB.16, 1009.

Patented Apr. 11, 1911.

2 SHEETS-SHEET 2- UNITED sTAtr sraTENT OFFICE.

GEORGE VINCENTZBARTON, OF LIVERPOOL, ENGLAND.

MANUFACTURE OF RED LEAD.

ground to an impalpable powder before being made into red lead or white lead. This is a costly process and has a very injurious effect, through the dust caused by it, on the constitutions of the workmen, and also it does not give as fine a body as can be secured by the processes of causing a blast to play upon molten lead. This process hitherto has always failed to produce a satisfactory red lead, in that it is found that an extremely fine dust of metallic lead is carried off with the lead oxid and in the subsequent treatment for maln'ng red lead this lead dust is very pernicious. Again, the shoveling of this extremely fine lead oxid into the lead furnace is very deleterious to the health of the workmen, as a great deal of dust is caused and further, it is almost impossible to prevent this dust from flying oil with the productsof combustion in the ordinary process. Now by the present in vent-ion, I make this extremely fine lead oxid absolutely clear of metallic lead, andwithout touching it in any way, de osit this lead oxid into chambers, and oxi ize it to red lead without touching the material.

The invention is-best described by the aid of the accompanying drawings, in which:

Figure 1 shows a vertical section of part of my apparatus; Fig. 2 a plan, partly in section, of other parts; Fig. 3 a vertical section through the red lead furnace, and Fig. 4 a section on line X-X, Fig. 1.

In these, A is an iron pot, B a stirrer ['caused to revolve in'said iron pot by gearing above from any suitable source of power. a D is a battle-plate fixed across thepot at a height of about-six or seven inches from the bottom C is a blast pipe for conducting a" blast of air into the pot. The pipe is two inches in diameter, and the steam jet Cf isthree- Specification of Letters Patent.

Application filed February 15, 1909. Serial No. 477,964.

Patented Apr. 11, 1911.

sixteenths of an inch in diameter. The pipe is open to the air, which is injected by means of said steam jet. Any suitable means may be employed to produce the air blast.

S is a trap arranged so as to allow the lead to be poured into the pot without undoing the pot or opening a man-hole.

F is a tall pipe about six feet high, surrounded by a jacket H, which latter is slotted at the bottom, and a series of gasjets G is placed adjacent to the slots be.- tween the jacket and the pipe. Pipe F terminates in a chamber F, and from this extends a series of pipes I, having dampers J. Another pipe M, also with a damper, J, descends to a settling chamber E. The pipes I radiate to the red lead chambers 0r furnaces L. Each of these chambers has a sta'nd-pipe'T, surmounted by a filtering device U, whereby any dust which may es-" cape up this pipe is filtered out. The red lead furnace is of the mufile variety, and is provided with a chamber 0, having heating flues N and P around it, a chamber Q,

at one side with a coldair flue W under neath, and a door R which may be opened so as to rake the material out of chamber Q into the wagons X. U

The mode of action is follows: The pot A being filled to the height of about four or five inches with lead, and the stirrer B being set revolving, the steam blast C is set going, thus bringing a strong blast of air and steam against the surfaces of the lead'which is being agitated by the stirrer. The result is that the lead rapidly oxidizes, and a tremendous stream of lead oxid, finelydivided metallic lead and gases passes up the shaft F. This shaft F has previously been heated to a low red heat by the gasjets G. The result is, that the almost gaseous mixture of red lead, infinitely fine lead and air, steam and nitrogen is heated to a very considerable degree. This oxidizes all the fine lead. while the larger particles of lead fall back into the pot, and absolutely nothing but lead oxid and gases escape into the pipes'I and M. The dampers are so arranged that the stream flows into one of the chambers L, the air, gas and nitrogen pass up through the pipe T. and are filtered by the filter U from any'lead oxid. Tl'llS goes on until the pot is emptied. The blast is still allowed to blow into the pot until the temperature has been reduced to about 400, when lead is again run in, and the process repeated until the chamber L is filled to the required height. The chamber is now out off by its damper J, and another furnace charged in the same way, and so on until all the chambers are charged; then if there are no more, chambers to fill, the lead oxid is passed into the settling chamber E until such time as one of the chambers has sufliciently cooked its lead, and is scraped out. In that case the horizontal damper 0 shown in the drawings between the chamber 0 and the chamber Q is opened, and the red lead pushed into this chamber, the damper closed, when the red lead chamher is ready for a fresh supply. In the meantime, the red lead in the chamber Q cools down to a moderate heat when .it' is scraped out into wagons X. The material in the chamber E is drawn out from time to time, and dissolved in a solution of lead acetate and is afterward precipitated by carbonic acid to make white lead, or the material is carbonated in any other known manner.

I claim as my invention:

1. In combination with. means for producing an intimate mixture of finely-commmuted melted lead, steam and air; means for applying further heat to the resulting intimate mixture of dustand ases while the dust is in suspension in the air, until all the lead is. converted into oxid without fusing the oxid; and means for bringing the intimate mixture of oxid of lead and gases to red lead or depositing chambers.

2. The combination with a pot having a stirrer-mounted therein; of means for producing a blast upon the charge of lead with- 1n the pot; a baffle plate; an upwardly-extending pipe opening at its lower end into the upper portion of the pot; a casing around the pipe; means for heating the pipe nside the casing; and means for taking the m1xture of oxid of lead and gases thus produced, While the former is still in suspension 111 the gases, to red lead furnaces.

3. In combination with a pot; means for heating the same; means for supplying to it lead, steam and air, with violent agitation; means for heating the efliuent to such a degree as to oxidize the fine lead while still int mately mixed with the air and gases; a series of surrounding red lead furnaces; means for distributing the efliuent tothese furnaces; and means for filtering the air and gases escaping from these furnaces.

4. In combination with a pot, .means for heating the same; means for supplyinglead, steam and a1r to the pot; means for heating the eflluent to such a point asto oxidize the fine lead in the mixture during its passage from the pot; a series of surrounding red lead furnaces; means for distributing the effluent to these furnaces serz'atim; and an exit standpipe from each of these furnaces having a filtering device at the upper end.

5 In combination with a pot, a stirrer; an air and steam blast; av battle-plate; a high vertical exit having a heating device; muffle furnaces; means for carrying the eflluent matter fromthe high exit to the muflie furnaces; and means for allowing the gaseous material to escape while preventing the escape of the solid material.

0. In combination with an iron pot, means for playing an air and steam blast on the lead contained therein; an exit terminating at a point high above the pot; muflie furnaces; a settling chamber; a series of pipes extending from the exit to said furnaces and chamber; and means for regulating the transmission to the various furnaces or settling chamber, substantially as described.

7. In an apparatus for making red lead, the combination of a pot; an air and steam jet opening into the same; a baffle-plate; a stirrer; a series of red lead furnaces arranged adjacent to the pot; a-series of conduits connecting the exit of the lead oxid pot with the redlead furnaces; a settling chamber; a further conduit from the lead oxid pot to the settling chamber; and means for opening or cutting off any or all of these conduits as required.

8. The combination of a lead oxid manufacturing pot, a red lead mufile furnace; a

conduit connecting the two; means for heat ing the material during its passage through said conduit to a suflicient degree to oxidize all the lead; and a heating device surrounding the red lead mufi'le furnace in such manner that the products of combustion are prevented from entering the muffle furnace.

9. The combination of a lead oxid manufacturing pot, a red lead muflie furnace; a conduit connecting the two; a heating device on said conduit; a heating device surrounding the red lead muflie furnace in such manner that the products of combustion cannot enter the muflie furnace chamber; a closed chamber for depositing the finished red lead scraped out of the muflle furnace; and means for admitting the discharge ofthe same,

substantially as described.

In witness whereof, I have hereunto signed my name this 3rd day of February 1909, in the presence of two subscribing 

